KisKrnl.sys 2011.1.13.89 and earlier in Kingsoft AntiVirus 2011 SP5.2 allows local users to cause a denial of service (crash) via a crafted request that is not properly handled by the KiFastCallEntry hook.
https://exchange.xforce.ibmcloud.com/vulnerabilities/64723
http://www.securityfocus.com/archive/1/515767/100/0/threaded